Not sure if these are sold as I made but ive run several hemi 833-s the non mopar guys worked over. Just bought the crank hub insert and made the "Chevy" sized bushing and pressed it is.

You really want to open the AL case unit and see if it might be slick shifted and if so what shape its in and if its a home made unit or bought parts. Who knows might have some liberty gear parts in it.

Also look at the AL case good to see if the shafts that ride in the case are holed out or if someone got smart and bushed them prior to building it.